What makes the example in the townland of Glen, County Limerick, quietly remarkable is that it does not appear on any Ordnance Survey map. It exists in the archaeological record not because anyone stumbled across it on the ground, but because a camera mounted on an aircraft caught it from above, revealed briefly in the patterns of a growing crop.

The site was identified during the Bruff aerial photographic survey in 1986, recorded as image reference Bruff 62 (AP 4/3681), when it showed up as a circular cropmark. Cropmarks form when buried features, ditches, banks, or walls affect the soil's moisture and nutrient content in ways that make overlying vegetation grow differently, becoming visible from altitude even when nothing is apparent at ground level. The monument sits in pasture roughly 100 metres south-west of the stream that marks the townland boundary with Gortnanuv. More recently, examination of OSi orthoimagery has revealed it as one of several semi-circular shapes defined by low scarps, suggesting the broader landscape here may preserve a cluster of related features. Fifty-five metres to the south lies a separate hut site, catalogued under reference LI024-299, hinting that this was once a more inhabited corner of the countryside than its current quietness would suggest.

Because this feature was identified primarily through aerial photography and remote sensing rather than ground survey or excavation, visiting it requires a certain amount of patience and calibrated expectation. The low scarps that define it on orthoimagery may be subtle to the point of near-invisibility in person, particularly under thick summer pasture. The boundary stream with Gortnanuv provides a useful navigational reference, with the site lying to its south-west. The surrounding land is farmland, so any approach should be made with appropriate consideration for access. The most rewarding time to look is likely late spring or early summer, when differential crop or grass growth can, on occasion, echo what the 1986 survey aircraft recorded. The monument itself has never been formally excavated, and its date and precise character remain unconfirmed beyond what aerial observation can suggest.